USDA hardiness zone 13a
In zone 13a, the average annual extreme minimum temperature is 60 to 65°F (15.6 to 18.3°C), based on 1991–2020 data from the 2023 USDA Plant Hardiness Zone Map.
Temperature range60 to 65°F15.6 to 18.3°C
ZIP codes102in this half-zone
Major cities0on this site
Typical last frostRare30% risk, estimate
What zone 13a means for your garden
A plant labeled "hardy to zone 13a" should survive a typical winter low of 60°F. Tropical and subtropical plants are an option, but many temperate fruit trees may not get enough winter chill. Zone 13b is the warmer half of zone 13.
ZIP codes in zone 13a: 100 in Puerto Rico, 2 in Hawaii.
Frost dates in zone 13a
No major city on this site is in zone 13a. At NOAA stations in this zone a 32°F frost is rare (estimate: frost rare at 15 NOAA stations).
Planting calendar for zone 13a
| Crop | Planting windows (frost-free climate) | |||
|---|---|---|---|---|
| Tomato | Jan 15 – Mar 31; Aug 1 – Sep 15 | |||
| Pepper | Feb 1 – Apr 15; Jul 15 – Aug 31 | |||
| Lettuce | Sep 15 – Feb 15 | |||
| Green Beans | Feb 15 – Apr 30; Aug 15 – Sep 30 | |||
| Sweet Corn | Feb 15 – Apr 15; Aug 1 – Aug 31 | |||
| Zucchini & Summer Squash | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Cucumber | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Carrot | Sep 1 – Feb 28 | |||
| Onion | Oct 15 – Jan 15 | |||
| Potato | Jan 1 – Feb 28; Sep 1 – Oct 15 | |||
| Basil | Mar 1 – Jun 30; Aug 15 – Sep 30 | |||
| Spinach | Oct 1 – Feb 15 | |||
| Kale | Sep 1 – Feb 15 | |||
| Broccoli | Sep 1 – Jan 15 | |||
| Peas | Oct 1 – Jan 31 | |||
| Eggplant | Feb 15 – Apr 30; Jul 15 – Aug 31 | |||
| Cabbage | Sep 1 – Jan 31 | |||
| Radish | Sep 15 – Mar 15 | |||
| Strawberry | Oct 1 – Nov 30 | |||
| Beets | Sep 15 – Feb 28 | |||
Where zone 13a occurs
None of the 512 major cities on this site sits in zone 13a. It occurs mostly in thinly populated areas (ZIP codes: 100 in Puerto Rico, 2 in Hawaii).